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Troubleshooting for Simultaneous UPS Fault Codes 16, 20, 28
Applicable Models: HT(R)X 01–20KVA S L
Q: The UPS shows fault codes 16, 20, 28 at the same time. According to the maintenance manual, these indicate “Utility Abnormal”, “Bypass Volt Abnormal” and “Bypass Freq Over Track”. How to troubleshoot?
A: When these three faults appear together, the cause is very likely abnormal input power supply. Please follow the steps below to diagnose:
1.Check whether the input power supply to the UPS is abnormal.This kind of fault is especially common when the power source is a generator, transformer, or similar equipment.
2.Check that all circuit breakers connected to the UPS are closed,especially the input and bypass circuit breakers on the UPS.
3.Check for internal module faults on the UPS input side,such as a blown input fuse.

1.6-20KUPS cannot directly set 21-24 lead-acid batteries on the display screen and needs to be set in MTR software. Standard software can support 21-24 lead-acid batteries.
2.If the customer needs to directly connect 21-24 lead-acid batteries to the UPS on the display screen, the UPS software needs to be programmed as the non-standard program.

The oil leaking from the motor shaft is rust preventive oil. Its purpose is to prevent the shaft from rusting during transportation. This is a normal phenomenon and not a fault.

Troubleshooting steps:
1. Check whether the wiring between the access control machine and the sliding door is correct. On the access control machine side, there are four wires: COM, NO, SEN, GND. On the sliding door access control machine side, connect NO to the access control signal input, COM to the common terminal, and SEN to the interlock output.

Troubleshooting steps:
1-Check the protection status: Status → Protection Status → Filter clogged (normally it is CLOSE; alarm is OPEN).
2-If the status is OPEN, manually reset the alarm and observe whether the status in step 1 changes.
3-If it changes, the alarm logic is fine; other components (filter, differential pressure switch) need to be checked.
4-After resetting the alarm, open the rear door and observe whether the alarm reappears.
5-If the alarm continues to appear, it means the issue is unrelated to the filter; the airflow switch needs to be checked.
6-Check whether the detection port of the airflow switch is blocked, and whether the airflow switch threshold setting is correct.

1. Check whether the voltage of the switchgear at the front end of the inverter is normal
 2. Check whether the inverter input voltage coefficient is normal; the default is 100%. 
3. Check whether the voltage detection board is working properly and verify its specifications and model
 4. If the actual measured voltage matches the customer's on-site voltage, adjust the input voltage detection coefficient to keep the inverter and the customer's site voltage consistent, avoiding system misidentification of undervoltage and accidental tripping

1. Model: If the suffix is-L-06, select GD5000-06; if the suffix is-L-07, select GD5000-07; if the suffix is-S/-D, select GD5000-00. 
2. Version Select a large version of MCU, old and new only configuration table is different, the same function 
3. When UPD is selected for communication, the address is 192.168.1.2 (default address of main control board) 
4. When COM is selected for communication, USB to RS485 serial port is required to connect to the system IO board. 
5. Other defaults 
6. The local Ethernet address of the computer needs to be manually set to IPV4 is 192.168.1.X (X≠2)

When the system can be temporarily shut down according to production process requirements, a manual bypass cabinet is used, allowing operators to switch between variable-frequency and line-frequency operation. When the system cannot be shut down according to production process requirements, an automatic bypass cabinet is used, with the switching process performed automatically. Both manual and automatic bypass cabinets have the same dimensions: 1000 × 1200 × 2350 (width × depth × height, in millimeters).

What is the maximum supported power of the 24V DC output in the 4KW GD20 inverter? Will it cause any issues if several 48mA small relays are driven?
A: 1. Firstly, it is not recommended to forcibly use the built-in power supply driver of the inverter. If you want to use the built-in 24V power supply for load driving, the first step is to consult the product specification / manual of the corresponding inverter to confirm the maximum output current of the 24V auxiliary power supply.
2. Taking a maximum output current of 200mA as an example. Corresponding to a rated power of 4.8W, a small relay with 48mA can drive 4. Considering line voltage drop, surge current and safety redundancy, calculate the long-term safe current as 70% of the rated current (i.e. 140mA). For this inverter, the recommended number of relays driven by 48mA is no more than 3 to avoid overloading and damage to the 24V built-in power supply.
3. If the load demand exceeds the power capacity of the 24V power supply specified in the specification, it is recommended to connect an independent switching power supply externally.